2 years ago,the difference of the ages of vishal and his son was 27 years.if the sum of their ages is 57 years,then find their ages

Let's, consider Vishal's age as x
Let's, consider Vishal's son's age as y
2 years ago,
        x - y = 27  
        x + y = 57
       (x - y) + (x + y) = 57 + 27
        x - y + x + y = 84
       2x = 84
       x = 84 / 2 = 42
Vishal's son's age = 57 - 42 = 15

Vishal's present age = 42 + 2 = 44
Vishal's son's present age = 15 + 2 = 17